Lost bright blue dog collar with silver heart tag near Magdalen Bridge Park, Oxford.

I lost my dog's collar in the park near Magdalen Bridge in Oxford. It’s a bright blue collar with a silver heart tag that has my phone number engraved on it. I walked my dog there on Tuesday afternoon, and I realized it was missing when we got home. It’s really important because the collar is special to me, so I hope someone can help us find it!